linux-kernel - Re: [PATCH] net: sctp: Rename fallthrough label to unhandled

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Message-ID: <eac3fe457d553a2b366e1c1898d47ae8c048087c.camel@perches.com>
Date:   Wed, 31 Jul 2019 04:32:43 -0700
From:   Joe Perches <joe@...ches.com>
To:     Neil Horman <nhorman@...driver.com>
Cc:     Vlad Yasevich <vyasevich@...il.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: sctp: Rename fallthrough label to unhandled

On Wed, 2019-07-31 at 07:19 -0400, Neil Horman wrote:
> On Tue, Jul 30, 2019 at 10:04:37PM -0700, Joe Perches wrote:
> > fallthrough may become a pseudo reserved keyword so this only use of
> > fallthrough is better renamed to allow it.
> > 
> > Signed-off-by: Joe Perches <joe@...ches.com>
> Are you referring to the __attribute__((fallthrough)) statement that gcc
> supports?  If so the compiler should by all rights be able to differentiate
> between a null statement attribute and a explicit goto and label without the
> need for renaming here.  Or are you referring to something else?

Hi.

I sent after this a patch that adds

# define fallthrough                    __attribute__((__fallthrough__))

https://lore.kernel.org/patchwork/patch/1108577/

So this rename is a prerequisite to adding this #define.

> > diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
[]
> > @@ -2152,7 +2152,7 @@ static enum sctp_ierror sctp_verify_param(struct net *net,
> >  	case SCTP_PARAM_SET_PRIMARY:
> >  		if (net->sctp.addip_enable)
> >  			break;
> > -		goto fallthrough;
> > +		goto unhandled;

etc...